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PortOut

Table of Contents

  1. Hello World!
  2. API
  3. Related

/media/uploads/mbedofficial/digitalout_interfaces.png

The PortOut interface is used to write to an underlying GPIO port as one value. This is much faster than BusOut as you can write a port in one go, but much less flexible as you are constrained by the port and bit layout of the underlying GPIO ports.

A mask can be supplied so only certain bits of a port are used, allowing other bits to be used for other interfaces.

Hello World!

// Toggle all four LEDs

#include "mbed.h"

// LED1 = P1.18  LED2 = P1.20  LED3 = P1.21  LED4 = P1.23
#define LED_MASK 0x00B40000

PortInOut ledport(Port1, LED_MASK);

int main() {
    int v = ledport;
    ledport.output();
    while(1) {
        ledport = LED_MASK;
        wait(1);
        ledport = 0;
        wait(1);
    }
}

API

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